P0694 Cooling Fan 2 Relay Control Circuit High

P0694 – OBD-II Trouble Code Technical Description

Cooling Fan 2 Relay Control Circuit High

What does the fault code mean P0694?

OBD-II Trouble Code P0694 stands for “Blower Control Circuit 2 High.” This code can be applied to different makes and models of cars. It occurs when the engine control module (PCM) detects that the voltage on the fan 2 control circuit is 10% or more above the manufacturer's settings.

Fan 2 is used to cool the engine and can change its speed depending on the coolant temperature. The PCM controls fan operation, including fan speed, according to engine operating conditions.

The P0694 code indicates a potential problem in the fan 2 control circuit, which can be caused by a variety of factors, such as a faulty fan, wiring or connector problems, or a faulty PCM.

Resolving the P0694 code may require:

1. Check and, if necessary, replace the cooling fan.
2. Diagnose and eliminate problems with wiring and connectors in the fan control circuit.
3. Check the condition of the PCM and possibly replace it.

For accurate diagnosis and repair, it is recommended that you contact a vehicle service technician or an authorized service center for your vehicle brand, as specific procedures may vary depending on the model and year of manufacture.

Possible reasons

Code P0694 may be associated with one or more of the following problems:

1. Cooling fan relay malfunction.
2. Blown cooling fan fuse.
3. Cooling fan motor malfunction.
4. Damaged, burnt, shorted or corroded wiring.
5. Problems with the connector.
6. Faulty engine coolant temperature sensor.
7. In rare cases, a faulty engine control module (PCM) may be the cause.
8. Problems with the fan 2 relay harness, such as an open or shorted circuit.
9. Poor electrical contact in fan relay 2 circuit.
10. Fan relay 2 is not operating correctly.
11. There may be a poor electrical connection in the fan 2 circuit.
12. A rare case is a faulty engine control module (PCM).

To accurately diagnose and solve the problem, it is recommended to contact a car service specialist or an authorized service center of your car brand.

What are the symptoms of a fault code? P0694?

Symptoms of a P0694 code include:

1. Overheating of the engine.
2. The Malfunction Indicator Light (MIL), also known as the check engine light, comes on.
3. Possibility of engine overheating due to inoperative cooling fans, which requires caution when driving in such conditions.
4. Check Engine Light on the instrument panel, with code P0694 as a stored fault.
5. Incorrect operation of the air conditioning system.
6. Engine overheating is accompanied by additional engine noise.
7. Problems starting or running the engine.
8. Incorrect or missing ignition timing.
9. Increased fuel consumption.

The P0694 trouble code is related to the cooling system, and its seriousness is the risk of engine overheating, which can lead to serious damage and costly repairs. Therefore, it is recommended to diagnose and fix this problem as soon as possible.

How to diagnose a fault code P0694?

Causes of the P0694 code and how to fix them:

1. Faulty cooling fan relay - check the relay, replace it if faulty.
2. Blown cooling fan fuse - Check the fuses and replace them if necessary.
3. Faulty Fan Motor - Check the operation of the fan motor and replace it if it is not working properly.
4. Damaged, burnt, shorted or corroded wiring - Inspect the wiring carefully and repair or replace damaged areas.
5. Connector problem - check the condition of the connectors and fix them.
6. The engine coolant temperature sensor is faulty - check the sensor and replace it if necessary.
7. Rarely, the problem may be related to a faulty PCM - in this case, contact a professional to diagnose and replace the PCM.

To detect the P0694 code, you must diagnose and repair the indicated problems. If necessary, replace faulty cooling system components and check all associated wiring. This will help avoid the risk of engine overheating and costly repairs.

Diagnostic errors

“Mechanic errors when diagnosing P0694”

When diagnosing the P0694 code, mechanics may make the following mistakes:

1. Replacing the Relay Without Testing – Some mechanics may immediately replace the cooling fan relay without doing more detailed diagnostics, which may be unnecessary if the problem is with other components.
2. Failed Relay Replacement - If the wrong relay is selected when replacing a cooling fan relay, it can damage the PCM, especially if the manufacturer warns about relay differences.
3. Insufficient Wiring Inspection – Some mechanics may not inspect the wiring thoroughly enough, which may miss potential problems.
4. Malfunctioning PCM – In rare cases, unless a mechanic does a complete diagnosis, a malfunctioning PCM may go undetected.

To prevent these errors, mechanics are advised to conduct more detailed diagnostics, check the resistance and condition of components, and be careful when replacing relays and follow the manufacturer's recommendations. This will help avoid additional problems and costly repairs.

How serious is the fault code? P0694?

Trouble code P0694 can be considered serious, especially because it is related to the engine cooling system. The severity of this error comes with the risk of the engine overheating, which can lead to damage to critical components and costly repairs. If the cooling fans do not function properly due to this error, the engine may overheat, potentially causing serious damage and failure.

Therefore, when a P0694 code is detected, it is recommended to take action to resolve it as soon as possible. Once the problem with the fans and cooling system has been resolved, it is recommended that additional testing and diagnostics be performed to ensure that the system is functioning reliably and without errors.

What repair will help eliminate the code? P0694?

Trouble code P0694 (Fan Control Circuit 2 High) may require the following repairs:

1. Replace or repair faulty cooling fan components such as fan motor, relay, resistor and others.
2. Check and repair any corrosion, damage, shorts or breaks in wiring associated with the cooling system.
3. Check and replace the engine coolant temperature sensor if it is faulty.
4. Check and, if necessary, replace the engine control module (PCM), but this is rare.
5. Check the cooling fan relay and replace it if it is faulty.
6. Check all fuses associated with the cooling system and replace them if they are blown.
7. Check and replace the internal components of the fan motor if their resistance is not within normal values.
8. Inspect and test the continuity, resistance and grounding of all associated wiring and connectors.

It is recommended that you thoroughly diagnose and eliminate all possible causes of the P0694 code to ensure reliable and correct operation of the cooling system and avoid the risk of engine overheating.

What is P0694 Engine Code [Quick Guide]

P0694 – Brand-specific information

Trouble code P0694 can apply to different makes of vehicles, and the specific meaning may vary. Here are some P0694 definitions for certain brands:

1. P0694 – “Fan 2 Control Circuit High” (General Motors).
2. P0694 – “Cooling Fan 2 Relay Control Circuit High” (Ford).
3. P0694 – “Fan 2 control signal above acceptable level” (Toyota).
4. P0694 – “Cooling Fan 2 Signal High” (Honda).
5. P0694 – “Cooling fan control error” (Volkswagen).
6. P0694 – “Cooling fan 2 control signal” (Nissan).
7. P0694 – “Incorrect cooling fan 2 signal” (Hyundai).

Please note that decryptions may vary depending on the specific model and year of manufacture of the car. To get more accurate information about the P0694 code for your specific make and model, it is recommended to check an official repair manual or contact a professional mechanic.